In a medium bowl, sift together flour, cocoa powder, baking powder, salt, ginger, cinnamon and clove. In a large mixing bowl, on medium speed, beat together butter, brown sugar and vanilla until creamy and smooth. Beat in egg, molasses and chocolate until well combined. Reduce mixer speed to low and beat in dry ingredients until just combined. Stir in chocolate chips until combined. Chill dough 1 hour or until cold.